Method of manufacturing plugs or bushings for paper-rolls and other articles.



No. 798,733. PATENTED SEPT. 5, 1905. F. KAUFMAN. METHOD OF MANUFACTURING PLUGS 0R BUSHINGS FOR PAPER ROLLS AND OTHER ARTICLES.

APPLICATION FILED OCT. 19,1903.

UNITED sTA rns PATENT orruon.

FRANK KAUFMAN, OI? CIIICACC, ILLINOIS.

METHOD OF MANUFACTURING PLUGS 0R BUSHINGS FOR PAPER-ROLLS AND OTHER ARTICLES.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed October 19, 1903. Serial No. 177,583.

To when] H 'nm cancer/L:

Be it known that I, FRANK KAUFMAN, a citizen of the United States, residing at Chicago, j 1n the county of Cook and State of Illinois, have invented certain new and useful Improvements in Methods of Mann facturing Plugs or Bushlngs tor Paper-Rolls and other Articles, of

which the following is a full, clear, and exact i specification.

My invention relates to that class of bushings commercially known as plugs used in the ends of rolls of paper and which are usually conical with an axial passage for the shaft or rod on which the paperroll turns while i These plugs or bushings are being unwound. usually manufactured of wood, they being turned out of the solid blocks; but owing to the expense of thus making them efforts have been made to find cheaper substitutes that will be equally effective.

Hence my invention has for its primary object to produce a plug or bushing that will resemble wood and one which will be cheap suitable mold --such, for example, as the mold 1 at plurality of which are shown and each of which is formed with a central pin 2, which produces the axial passage through the plug for the shaft or rod on which the roll turns. In lilling these molds it is desirable that the operation be performed without pressure, because if the wet sawdust is pressed while being molded it will subsequently expand and distort and disintegrate the plug. In the water in which the sawdust is soaked I employ a small percentage ofglue or other suitable adhesive of sufficient quantity to cause the particles of sawdust to hold together while the plug or other article to be molded is being removed from the mold and subjected to the subsequent stepsof the process. This, however, requires but a very small percentage of glue, and the amount may be readily determined in practice by the requirements of each particular case,

it being borne in mind that if the molded article after it comes from the mold and before it is treated with the rosin is not subjected to rough usage it is only necessary to employ a sutlicient quantity of glue to prevent it from crumbling while being dried. As a means of removing the plugs from the mold the mold may be turned upside down on a wire tray 3, which is lirst placed over the mold to prevent the plugs from falling out while the mold is being turned over, and consequently when the mold is lifted from the tray the plugs will be left standingon the latter, and the tray may then be set aside until the moisture of the plugs has dried out, or they may be subjected to artificial heat in a drying-oven or other suitable place to hasten this operation. After the plug has dried sulliciently it is dipped in liquid rosin, the wire tray, with a large number of plugs supported thereon, being preferably dipped in the rosin at one time, and the tray is then again set to one side for the rosin to cool. The article may be left in the liquid rosin until the rosin penetratesentirely through the sawdust if a plug of the maximum strength is desired, or if a plug of less strength will answer it may be left until the rosin penetrates partially through it, thus forming a hard shell or coating, which serves to hold the inner particles of sawdust together. By adding a small percentage of paraflin or pine-pitch to the rosin before the plug is dipped therein the strength of the plug may be greatly augmented, this addition serving to toughen the rosin and render it less brittle. Should it be desired to color the plugs thus produced, the coloring-matter may be added to the rosin in its liquid state and applied to the plug by the same operation which impregnatcs the plug with the rosin.

Articles thus produced from sawdust and rosin are hard and tough and very much rcsemble pine wood in appearance and texture, and by thus dipping the articles in hot rosin after they are molded instead of commingling the rosin with the sawdust prior to the molding a much lower percentage of rosin is required and the operation of producing the article may be performed by a less expensive method.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is

l. The lrereinalescribed method of producing articles from sawdust, which consists in first soaking the sawdust in water and molding articles from sawdust, which consists in first soaking the sawdust in waterand mixing an adhesive therewith, then molding the sawdust into the desired form and drying the article thus molded, and after the article is dried impregnating it with liquid rosin.

FRANK KAUFMAN.

Witnesses:

JOHN J. HOOVER, G. E. CLARK. 

